We have some folks looking for centerboards for their Alcort Catfish, so we went out to get a pattern of of SMEDLEY's centerboard. Not sure how many other catamarans had centerboards back then, but they make it nice to slide right up on the beach.
First a little note about the centerboard, when it is on the trailer it won't drop straight in because the leading edge is longer than the top of the trunk, the tip needs to angled in first.
We traced the centerboard onto thin birch plywood and cut out the pattern with a DeWALT 20V Brushless jigsaw.
Video: https://youtu.be/jtkDi_hFWs8
The thickest part of the centerboard measured out at 9/16th inches, but we believe it could be thinned down to 1/2 inch as long as a good grade of marine plywood was used. Otherwise break out the planers.
Notes on centerboard measurements: https://youtu.be/Nw97_r1bTbE
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